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MORTGAGE LOAN RECEIVABLES - Mortgage Loan Receivables by Loan Type (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Mortgage Loans on Real Estate [Line Items]        
Outstanding Face Amount $ 2,371,827 $ 2,321,194    
Provision for loan losses (4,000) (3,700) $ (3,100) $ (2,500)
Carrying Value 2,353,977 2,310,409    
First mortgage loan, held for investment        
Mortgage Loans on Real Estate [Line Items]        
Outstanding Face Amount 1,843,006 1,462,228    
Carrying Value, Gross 1,832,626 1,456,212    
Mezzanine loan, held for investment        
Mortgage Loans on Real Estate [Line Items]        
Outstanding Face Amount 168,303 287,328    
Carrying Value, Gross 167,469 286,133    
Mortgage loan receivables held for investment, at amortized cost        
Mortgage Loans on Real Estate [Line Items]        
Outstanding Face Amount 2,011,309 1,749,556    
Carrying Value, Gross 2,000,095 1,742,345    
Provision for loan losses (4,000) (3,700)    
Carrying Value 1,996,095 1,738,645    
First mortgage loan, held for sale        
Mortgage Loans on Real Estate [Line Items]        
Outstanding Face Amount 360,518 571,638    
Carrying Value 357,882 571,764    
Mortgage loan receivables held for sale        
Mortgage Loans on Real Estate [Line Items]        
Outstanding Face Amount 360,518 571,638    
Carrying Value $ 357,882 $ 571,764